Safety device fitted with window curtains

ABSTRACT

A safety device fitted with window curtains comprising a stopper safety hanger, a single wheel safety hanger and several safety clamps. When an object is caught by the curtain string, a small copper ball of the stopper safety hanger goes sideways from a copper wheel contracted by a steel spring wire making the copper wheel drop by its weight and loose the curtain string. A single wheel hanger is fitted for easy, balanced and convenient operation. Two string safety clamps automatically spring out from the two hangers by action of the spring clamp. The loosened curtain string separates the entangled object from danger guaranteeing safe operation of window curtains.

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The present invention is safety device having a fitting of windowcurtains, which is used in case of an accident when a curtain string isinvolved.

[0003] 2. The Prior Art

[0004] The basic structure of a window curtain contains the structureitself plus fittings comprising a hanger, a curtain string and a fixingdevice for the string. Because the curtain string is rather long,children might be caught by the neck when playing around. Tragedy islikely to happen causing death without other people around to helploosen the string. Pets also might be caught by the curtain string aswell.

[0005] The small copper ball on the stopper hanger in the existingwindow curtain is fixed by an aluminum nail to the shell case. Thesafety requirement can not be guaranteed for the existing stopper hangerwhen an object is entangled by the curtain string because the stringwill not release automatically.

[0006] For the existing type of single wheel hanger, the roller is fixedby aluminum nail to the shell leaving a clearance between the end faceof roller and the shell. The difficulty is that the string will slip andjam into the gap when operating the curtain. The jamming of the curtainstring decreases the safety of the single wheel hanger which is usedtogether with the stopper hanger for balanced operation.

SUMMARY OF THE INVENTION

[0007] It is therefore an object of the present invention to provide asafety device to go with the curtain assembly, which will automaticallyrelease the string when an object is entangled to ensure the safe use ofthe window curtain in a simpler and easier way.

[0008] The invention comprises a safety device fitted with windowcurtains having a stopper safety hanger and a single wheel safety hangerto be fitted at both ends of the top beam, and safety clamps in theclamping holes of the stopper safety hanger and the single wheel safetyhanger.

[0009] The stopper safety hanger comprises a shell, a double steel wire,a copper wheel, a small copper ball and steel spring wire. The curtainstring is jammed in between the copper wheel and the small copper ball.A slide groove is made in the wall of the shell and the small copperball inserted in the slide groove with the two ends of the steel springon the shell to hold the small copper ball. The double steel wire limitsthe position of the copper ball.

[0010] The single wheel safety hanger comprises a shell, a roller and arivet. The rivet is to fix to the shell and can move freely inside theshell. The roller has a groove which forms a concave ring for thecurtain string to slide in.

[0011] The curtain string safety clamp comprises a spring clamp andplastic shell. The spring is put in the central groove of the plasticshell. The plastic shells separately join into the holes in the stoppersafety hanger and the single wheel safety hanger. The curtain stringseparately fixes to the plastic shell. The other end of the curtainstring may pass the safety ring.

[0012] The present invention comprises the stopper safety hanger, singlewheel safety hanger and curtain string. When an object is wound on thecurtain string, the small copper ball in the stopper safety hanger goesbeside the copper wheel by traction of the steel spring wire and thecopper wheel drops, making the string loose. Compared with the presenttechnology, the small copper ball is not fixed to the shell butpositioned inside the stopper shell with moving room, which will allowthe small copper ball to have some room and not to jam the curtainstring. The loosening of the curtain string will guarantee safeoperation of the window curtain.

[0013] In the single wheel safety hanger, the roller has a concavegroove which is used for the slide groove for the curtain string. Theroller is put into the housing body of the shell and will not be jammedby the outgoing string. Compared with the present technology, thepresent invention is flexible and balanced for easier operation.

[0014] The present invention is used with the single wheel safety hangerand the stopper safety hanger. The easy operation of the single wheelsafety hanger will ensure the balanced and safe operation of the stoppersafety hanger.

[0015] Thanks to the safety clamps positioned separately inside theholes in the stopper safety hanger and the single wheel safety hanger,when an object is caught by the curtain string at a certain weight, thecurtain string will spring out by force of the spring clamp from theclamping holes of the stopper safety hanger and single wheel safetyhanger and loosen the string to the ground with the effect that thedanger is eliminated for the children or pets thus caught.

[0016] Compared with the existing technology, the present inventionensures safe operation of the curtain assembly.

[0017] When an object is caught by the curtain string, the curtainstring will loosen by force of the spring clamp from the clamping holesof the stopper safety hanger and single wheel safety hanger with theeffect that the caught object is freed without other people's help. Itis a simple structure for easy and convenient operation.

[0018] The present invention has no complicated fittings with its simplestructure. The curtain string will not jam in operation to ensure easyand convenient operation.

BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Other objects and features of the present invention will becomeapparent from the following detailed description considered inconnection with the accompanying drawings. It is to be understood,however, that the drawings are designed as an illustration only and notas a definition of the limits of the invention.

[0020] In the drawings, wherein similar reference characters denotesimilar elements throughout the several views:

[0021]FIG. 1 is assembly of the safety device fitted with the windowcurtain;

[0022]FIG. 2 is the structure of the stopper safety hanger;

[0023]FIG. 3 is the left view of FIG. 2;

[0024]FIG. 4 is the structure of the single wheel safety hanger fittedwith the safety device;

[0025]FIG. 5 is the top view of FIG. 4;

[0026]FIG. 6 is the structure of the safety clamp of the safety device;

[0027]FIG. 7 is the assembly diagram of the curtain string, safetyclamp, stopper safety hanger and single wheel safety hanger;

[0028]FIG. 8 is the top view of the FIG. 6;

[0029]FIG. 9 is the A-A sectional view of FIG. 6;

[0030]FIG. 10 is the layout of the clamping hole position on the concavegroove of the plastic shell of the safety device; and

[0031]FIG. 11 is the top view of the safety ring.

[0032]FIG. 12 is the cross-sectional view of the arc double rails.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

[0033] Referring now in detail to the drawings, FIG. 1 shows a safetydevice fitted with a window curtain, comprising: a stopper safety hanger1, a single wheel safety hanger 2 and two safety clamps for the curtainstring 3 and 16. Stopper safety hanger 1 and single safety hanger 2 arefitted at both ends of the hang beam. There is a safety clamp forcurtain string 3 and 16 fitted in the stopper safety hanger 1 and in thehole 15 of the single wheel safety hanger.

[0034]FIG. 2 and FIG. 3 show an embodiment of the application of thestopper safety hanger in the safety device of the present invention. Thestopper safety hanger comprises a shell 4, a double steel wire 5, acopper wheel 6, a small copper ball 7 and steel spring wire 8, thecurtain string 20, 21 jammed in between the copper wheel 6 and the smallcopper ball 7, double steel wire 5 limiting the copper wheel 6. When thedouble steel wire 5 is installed, the curtain string will be close tothe double steel wire and not that of the inner wall of the plasticshell to reduce friction and increase time of use. The shell 4 is thestopper plastic shell in which the slide groove 9 is made and the smallcopper ball 7 installed inside. The steel spring wire 8 on the shell 4is bent into a U shape and fixed to shell 4. The two ends of the steelspring wire 8 are fixed to the small copper ball. When operating thecurtain, if an object is caught to a certain weight, the steel springwire 8 will go beside and tract the small copper ball 7 away from thecopper wheel 6 which drops by its weight pulling down the string causingthe object to drop safely to the ground.

[0035]FIG. 4 and FIG. 5 shows an example of the embodiment of the singlewheel safety hanger in the safety device of the present invention. Thesingle wheel safety hanger comprises a plastic shell 10, a roller 11 anda rivet 12. The shell 10 is a plastic shell to which the roller axis isfixed to by rivet 12. The roller 11 has a concave groove and on theoutside surface is a concave ring for the string 20, which operates inthe ring with ease of balance.

[0036]FIG. 6 shows an example of the embodiment of the two safety clamps3, 16 in the safety device of the present invention. Safety clamps 3,16comprise spring clamp 13 and plastic shell 14 which is in U shape withthe two legs going outwards. Spring clamp 13 is fixed with the plasticshell 14. As shown in FIG. 7, plastic shell 14 of the two safety clamps3, 16 separately goes into holes 15 in the stopper safety hanger 1 andsingle wheel safety hanger 2. Curtain string 21, 20 is separately fixedto the center of the arc of the U shaped plastic shell 14 on the safetyclamps 3,16. When curtain string 21, 20 is under certain weight thesafety clamps 3, 16 will automatically spring out and the curtain stringwill drop to the ground. As shown in FIG. 8, to join the plastic clamp13 and the shell 14, a groove 17 is set in spring clamp 13 in theplastic shell 14. Four clamping points 18 are set on the upper part ofgroove 17. Clamping points 18 are evenly laid out on groove 17. Springclamp 13 and groove 17 act to press spring clamp 13 into groove 17 withclamping point 18 to fix the spring clamp 13 in the groove 17. Springclamp 13 increases the flexibility of the whole of the safety clampunder stresses.

[0037] As shown in FIG. 9 and FIG. 10, clamping point 18 is fixed to oneside of plastic shell 14 and the other extended to the upper part of thegroove 17 with some clearance between the facet and that of the groove.The section of clamping point 18 is in a ladder shape having a slatedtop. A design as such is to insert the spring clamp 13 into the groove17 smoothly. To fix tightly the safety clamps 3, 16 and the clampingholes 15 on the stopper safety hanger 1 and single wheel safety hanger2, a matching angle has been set up at the center of the plastic shell14.

[0038] The safety device of the present invention is fixed on the arcdouble rails 24 shown in FIG. 12. As shown in FIG. 1, FIG. 2, FIG. 4 andFIG. 6, single wheel safety hanger 2 comprises the safety clamp 16 andplastic shell 14. Curtain string 20 passes from behind curtain blade 22and lower rail 19, strides the front of the curtain, passes the arcdouble rails 24 and single wheel safety hanger 2, travels by the roller11, passes between the copper wheel 6 and the small copper ball 7 andpasses through the legs of the steel wire 5 to reach the safety ring 23.

[0039] Curtain string 21 on plastic shell 14 on stopper safety hanger 1,which goes from behind the curtain blade 22 and the lower rail 19,strides over the front of the curtain, passes the arc double rails 24and spring wire 8, travels between the copper wheel 6 and the smallcopper ball 7 and passes through the legs of the steel wire 5 to reachthe safety ring 23.

[0040] As shown in FIG. 11, safety ring 23 in the present invention is aframe with openings at the upper and lower part. A gear is inserted inthe longitudinal opening at the corresponding side. Two slide groovesare made on the other two inner walls. The gear can move along in theslide grooves and the longitudinal opening. The curtain string passesthe upper and lower opening to move along the inclined face to go intothe safety ring 23 with the gear tightening the string at the top of thelongitudinal opening. When an object is caught, the weight of the objectwill pull the string away from the gear and the string is loosened,guaranteeing the safety in operation.

[0041] The process of use is as follows: as shown in FIG. 1 whenoperating the curtain, pull down the safety ring 23 to make the curtainstring 20, 21 move. At this moment the copper wheel 6 will drop by itsweight and stop reaching the double steel wire 5. As the strings 20, 21move, the curtain blade 22 will roll up. When releasing the curtain,blade 22 rolls down and the teeth of the copper wheel 6 will go with therack traveling along the inclined face upwards until clamping the smallcopper ball and tightening the string 20, 21 to return to the originalposition.

[0042] Accordingly, while only a single embodiment of the presentinvention has been shown and described, it is obvious that many changesand modifications may be made thereunto without departing from thespirit and scope of the invention.

What is claimed is:
 1. A safety device fitted with window curtains,comprising: a hang beam; a stopper safety hanger (1) fitted at one endof said hang beam and comprising; a shell having a slide groove (9)opened on a wall of said shell (4); a double steel wire (5); a copperwheel (6); a small copper ball (7) installed in the slide groove (9); asteel spring wire (8); curtain strings (20), (21) disposed between thecopper wheel (6) and small copper ball (7); wherein two ends of thesteel spring wire (8) on the shell (4) join with the small copper ball(7) and the double steel wire (5) limits the copper wheel (6) position;a single wheel safety hanger (2) fitted at another end of said hangbeam, said single wheel safety hanger (2) comprising: a shell (4); aroller (11) having a concave groove located at the center of an encircleserving as a slide channel for the curtain string (20); and a rivet (12)connecting the roller and the shell (4), the roller (11) turning freelyin the shell (10); and several safety clamps for a curtain string, saidclamps fitted in holes of the stopper safety hanger and of the singlewheel safety hanger, said safety clamps each comprising: a spring clamp(13); and a plastic shell (14) flexibly connected to the spring clamp;said plastic shell (14) clamping separately into the holes (15) of thestopper safety hanger (1) and the single wheel safety hanger (2), andwherein curtain strings (21),(20) are fixed separately on the plasticshell (14).
 2. A safety device fitted with window curtains of claim 1,wherein: the curtain string (20) is fixed on the safety clamp of thesingle wheel safety hanger (2); the curtain string (20), by passing theroller (11) of the single wheel safety hanger, enters between the copperwheel (6) of the stopper safety hanger and the small copper ball (7);the curtain string (21), by passing the curtain and the steel springwire (8) of the stopper safety hanger (1), enters between the copperwheel (6) and the small copper ball (7) and then, by passing the legs ofthe double steel wire (5), enters the safety ring (23).
 3. A safetydevice fitted with window curtains of claim 1, wherein: the steel springwire (8) of the stopper safety hanger (1) bends into a U shape andtravels through and fixes with said shell (4).
 4. A safety device fittedwith window curtains of claim 1, wherein: the plastic shell (14) on thecurtain string contains a concave groove (17), and wherein said springclamp (13) is a steel wire matching the shape of the concave groove(17), the concave groove (17) having several clamping points (18) on it.5. A safety device fitted with window curtains of claim 1, wherein theplastic shell (14) of the safety clamp is in a U shape with 2 legstilting outwards.
 6. A safety device fitted with window curtains ofclaim 4, wherein one end of the clamping point (18) is fixed to one sideof the plastic shell (14) and the other end of the clamping pointextends to an upper part of the groove (17) opening, and wherein aclearance exists between the sides of the plastic shell and that of thegroove opening.
 7. A safety device fitted with window curtains of claim6, wherein a section of the clamping point (18) of the safety clamp isin a ladder shape with an inclined top.
 8. A safety device fitted withwindow curtains of claim 4, wherein four clamping points (18) of thesafety clamp are laid out in symmetric position on the groove (17).
 9. Asafety device fitted with window curtains of claim 1, wherein a clampingangle is set out matching the hole (15) at a center part of the plasticshell (14) of the safety clamp.
 10. A safety device fitted with windowcurtains of claim 2, wherein said safety ring (23) is a frame withopenings at top and bottom sides; one face of said ring being inclinedtop downwards; and an opposite side has a longitudinal opening in whicha roller is encased; and wherein slide grooves are cut at acorresponding location in inner walls of opposite sides of said frame;the roller moving along in the two slide grooves towards the opening;and wherein the curtain string goes through the safety ring (23) in adirection of the inclined face of the top and bottom opening; andwherein the gear grips teeth on the inner wall and catches the curtainstring at a top position on the longitudinal opening.